A comparative study on phyllosilicate and tectosilicate mineral structural properties

Stylianou, Marinos; Inglezakis, Vassilis J.; Agapiou, Agapios; Itskos, Grigorios; Jetybayeva, Albina; Loizidou, Maria

doi:10.5004/dwt.2018.21968

Cited by 16 publications

(19 citation statements)

References 166 publications

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“…The chemical composition of modified zeolites clearly indicates the aluminosilicate nature of the material as shown in Table 3. The Si/Al molar ratio of the NZU sample is 5.32 as expected for clinoptilolite [42]. The NZU-Na sample is enriched in Na as expected after the modification with NaCl, and according to the results, Na + it replaces Ca 2+ from the zeolite structure.…”

Section: Characterization Of Modified Zeolitessupporting

confidence: 65%

Surface Interactions and Mechanisms Study on the Removal of Iodide from Water by Use of Natural Zeolite-Based Silver Nanocomposites

et al. 2020

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In this work a natural zeolite was modified with silver following two different methods to derive Ag2O and Ag0 nanocomposites. The materials were fully characterized and the results showed that both materials were decorated with nanoparticles of size of 5–25 nm. The natural and modified zeolites were used for the removal of iodide from aqueous solutions of initial concentration of 30–1400 ppm. Natural zeolite showed no affinity for iodide while silver forms were very efficient reaching a capacity of up to 132 mg/g. Post-adsorption characterizations showed that AgI was formed on the surface of the modified zeolites and the amount of iodide removed was higher than expected based on the silver content. A combination of experimental data and characterizations indicate that the excess iodide is most probably related to negatively charged AgI colloids and Ag-I complexes forming in the solution as well as on the surface of the modified zeolites.

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Section: Characterization Of Modified Zeolitessupporting

confidence: 65%

Surface Interactions and Mechanisms Study on the Removal of Iodide from Water by Use of Natural Zeolite-Based Silver Nanocomposites

et al. 2020

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Section: Synthesis Of Nay Zeolite Seedssupporting

confidence: 68%

“…The large peak at 1140-450 cm −1 is assigned for the lattice Si-O-Si or Si-O-Al vibrations. The peaks observed at finger print area below 700 cm −1 are similar to that of the typical peaks from NaY [26]. The 29 Si and 27 Al solid state NMR from Figure 7 are very powerful probes to analyze the structure of Si and Al species in the aluminosilicate materials [29].…”

Section: Synthesis Of Nay Zeolite Seedsmentioning

confidence: 61%

“…FTIR spectra from Figure 2 shows that the spectra of raw materials, activated and purified kaolin had similar peaks. There were two sharp peaks between 3700 cm −1 and 3614 cm −1 assigned for stretching structural hydroxyl groups (-ν~Si-OH and~Al-OH respectively), typical from phyllosilicate aluminosilicates [26]. The 1650 cm −1 -1600 cm −1 band, attributed to adsorbed water molecule bending vibration (H-O-H), is observed.…”

Section: Characterization Of Raw Materialsmentioning

confidence: 93%

“…Overall, from all the characterization results, the silicate and aluminate precursors for synthesis of NaY have successfully been provided. Figure 3a displays the layered structure of kaolin, as a member of phyllosilicate group [12,26]. Meanwhile the metakaolin image in Figure 3b shows that the structure has been damaged and become amorphous after dehydroxylation.…”

Section: Sem Images Inmentioning

confidence: 99%

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Synthesis and Characterization of Crystalline NaY-Zeolite from Belitung Kaolin as Catalyst for n-Hexadecane Cracking

et al. 2019

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Crystalline sodium Y (NaY) zeolite has been synthesized using alternative natural source of aluminate and silicate, extracted from natural Belitung kaolin. Prior to use, the natural kaolin was pretreated to obtain fragmented metakaolin and extracted silica. Synthesis was conducted with the addition of NaY gel (two types of NaY seeds were used, prepared from colloidal sillica or sodium silica water) using hydrothermal method for 21 h at 100 °C. The characterization on the as-synthesized zeolites confirmed that the one prepared using colloidal silica-seed has closer structure similarity to NaY zeolite that was synthesized using pro analysis silicate and aluminate sources. Thus, the rest of the synthesis of NaY was carried out using colloidal silica-NaY seed. The NaY zeolites then were converted to HY, through ammonium-exchange followed by calcination, to be tested as cracking catalysts using n-hexadecane as a probe molecule. It shows that HY from metakaolin and extracted silica gives high performance, i.e., n-hexadecane conversion of 58%–64%, also C5-C12 percentage yield and selectivity of 56%–62% and 98%. This work has shown the potential to utilize kaolin as alternative silicate aluminate sources for crystalline zeolite synthesis and to obtain inexpensive and environmentally friendly catalyst materials.

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Local silica sand as a silica source in the synthesis of Y zeolite

Al‐Nayili

Rzoqy

2022

Asia-Pacific J Chem Eng

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The objective of this research is to generate Y zeolite using local silica sand as a source of silica via the hydrothermal method. Prior to synthesis, contaminants were removed from the local silica sand using hydrochloric acid, and Al2O3 was utilized as an aluminum source. Y zeolite was hydrothermally synthesized at 100± 1°C. Room temperature and 48 h were chosen as the aging temperature and period, respectively. In this synthesis, the impact of reaction time and different SiO2/Al2O3 and Na2O/SiO2 ratios were explored. The synthesized samples were characterized by XRD, SEM, and FT‐IR. Y zeolite, with a low SiO2/Al2O3 ratio (3.0–3.9), was synthesized at a high yield under low alkalinity conditions (Na2O/SiO2 = 0.9–2.0) after optimizing the synthesis time. The competitive phase was P zeolite, which was found in the products at high reaction time (12 h). However, pure Y zeolite with high crystallinity was produced under optimum circumstances, such as crystallization temperature (100°C) and 10 h. The findings reveal that reaction time has a role in the generation of Y zeolite. It has been revealed that low‐cost raw materials like silica sand can be utilized to produce Y zeolite. The NaY zeolites were subsequently transformed into HY by ammonium exchange and calcination.

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A comparative study on phyllosilicate and tectosilicate mineral structural properties

Cited by 16 publications

References 166 publications

Surface Interactions and Mechanisms Study on the Removal of Iodide from Water by Use of Natural Zeolite-Based Silver Nanocomposites

Surface Interactions and Mechanisms Study on the Removal of Iodide from Water by Use of Natural Zeolite-Based Silver Nanocomposites

Synthesis and Characterization of Crystalline NaY-Zeolite from Belitung Kaolin as Catalyst for n-Hexadecane Cracking

Local silica sand as a silica source in the synthesis of Y zeolite

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